20 Boötis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 19m 45.23479s[1] |
| Declination | +16° 18′ 25.0136″[1] |
| Apparent magnitude (V) | 4.85 |
| Characteristics | |
| Spectral type | K3 III |
| U−B color index | 1.4 |
| B−V color index | 1.23 |
| R−I color index | 0.6 |
| Astrometry | |
| Radial velocity (Rv) | –7.64 km/s |
| Proper motion (μ) | RA: –141.56[1] mas/yr Dec.: +60.48[1] mas/yr |
| Parallax (π) | 17.44 ± 0.22[1] mas |
| Distance | 187 ± 2 ly (57.3 ± 0.7 pc) |
| Absolute magnitude (MV) | 1.01 ± 0.09[2] |
| Details | |
| Mass | 1.14 ± 0.19[2] M☉ |
| Radius | 11.3 ± 0.5[2] R☉ |
| Surface gravity (log g) | 2.36 ± 0.08[2] cgs |
| Temperature | 4,472[2] K |
| Metallicity [Fe/H] | 0.16[2] dex |
| Rotation | 848 days[3] |
| Rotational velocity (v sin i) | 1.0[3] km/s |
| Age | 5.21 ± 2.28[2] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) | |
20 Boötis is a star in the constellation Boötes.
20 Boötis is an orange K-type giant with an apparent magnitude of +4.85. It is approximately 187 light years from Earth.
References
- 1 2 3 4 5 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752
, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357 - 1 2 3 4 5 6 7 da Silva, L.; et al. (November 2006), "Basic physical parameters of a selected sample of evolved stars", Astronomy and Astrophysics, 458 (2): 609–623, arXiv:astro-ph/0608160, Bibcode:2006A&A...458..609D, doi:10.1051/0004-6361:20065105
- 1 2 Setiawan, J.; et al. (July 2004), "Precise radial velocity measurements of G and K giants. Multiple systems and variability trend along the Red Giant Branch", Astronomy and Astrophysics, 421: 241–254, Bibcode:2004A&A...421..241S, doi:10.1051/0004-6361:20041042-1
External links
This article is issued from Wikipedia - version of the 12/24/2014. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.